Inventor General Discussion

Inventor General Discussion

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lemaycj
Posts: 45
Registered: ‎09-07-2011
Message 1 of 5 (941 Views)
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preventing a part to rotate in an assembly

941 Views, 4 Replies
04-17-2012 07:08 AM

I have an assembly of 3 parts.  I want to align holes from 2 of the parts and then fix them all in that position (as they will be welded together).  I can't figure out how to do that (lock-in position).  I restrained on axis and surface-to-surface but I don't know how to prevent 50168P and 50181B from rotating around.

 

There are several ways to go about this, but the simplest would be to create an Angle-Directed Angle constraint between 50183 YZ origin plane to 50168P YZ origin plane at 30 deg angle, and a Mate-Flush constraint between 50183 XZ origin plane to 50181B YZ origin plane.  I think that will give you what you're looking for.

*Expert Elite*
mcgyvr
Posts: 7,248
Registered: ‎12-01-2004
Message 2 of 5 (936 Views)

Re: preventing a part to rotate in an assembly

04-17-2012 07:17 AM in reply to: lemaycj

Typically the first part placed into an assembly is automatically "grounded" (ie..it cannot move anywhere)

Then you place the rest of the parts and constrain then fully to remove any "degrees of freedom"

 

You could just set any/all parts as "grounded" (right click on the part and select "grounded") once you have constrained them to remove most of the degrees of freedom BUT I think its always best to fully constrain all parts. (well I do leave screws/bolts partially constrained I guess..They are insert constrained into their holes but can still spin around which really doesn't matter)

 

The problem with just grounding all parts is that if you change something they won't update their placement based on their constraints to other parts..

 

Frankly I think that an assembly should only have 1 if any parts grounded.. All others should be ungrounded. In my opinion..

 

 

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Curtis_Waguespack
Posts: 3,002
Registered: ‎03-08-2006
Message 3 of 5 (928 Views)

Re: preventing a part to rotate in an assembly

04-17-2012 07:35 AM in reply to: lemaycj

Hi lemaycj, 

 

Most often I use an angle constraint placed between origin work planes of the part files (expand the Origin folder in parts of the browser tree) to prevent unwanted rotation.

 

I hope this helps.
Best of luck to you in all of your Inventor pursuits,
Curtis
http://inventortrenches.blogspot.com




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Valued Contributor
TheRham
Posts: 58
Registered: ‎11-08-2007
Message 4 of 5 (927 Views)

Re: preventing a part to rotate in an assembly

04-17-2012 07:35 AM in reply to: lemaycj

There are several ways to go about this, but the simplest would be to create an Angle-Directed Angle constraint between 50183 YZ origin plane to 50168P YZ origin plane at 30 deg angle, and a Mate-Flush constraint between 50183 XZ origin plane to 50181B YZ origin plane.  I think that will give you what you're looking for.

Valued Contributor
sathersc23
Posts: 63
Registered: ‎05-02-2011
Message 5 of 5 (832 Views)

Re: preventing a part to rotate in an assembly

11-30-2012 12:54 PM in reply to: mcgyvr

mcgyvr,

 

Do you use Vault? Do you have issues with hardware causing edited out of turn errors when it's not locked down?

 

Thanks,

 

-Sam

Sam Sather
CAD Admin/Designer
Inventor 2012
Vault Pro 2012 16.1.58.0
Intel Xeon X5690 @ 3.47 GHz
12.0 GB Ram
Windows 7 x64
AMD FirePro V7900 - 8.830.5.6000

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